3. Exercise-induced hematuria

Exercise-induced hematuria (EIH), also known as post-exertional hematuria, refers to blood in the urine that occurs after a person exercises.

Doctors are not sure what causes EIH, but it tends to be associated with high-intensity exercise, rather than the duration of exercise.

People who do not stay properly hydrated while exercising may also have an increased risk.

A 2014 study investigated the occurrence of EIH in a group of 491 healthy adult participants.

A total of 12 percent showed EIH following a time-restricted 5-kilometer run. This figure dropped to just 1.3 percent when participants completed the run without any time restriction, suggesting that blood in the urine occurred due to the intensity of the effort during the timed run.

The authors note that EIH usually resolves within 3 days and suggest seeing a doctor for any bleeding that lasts longer than 2 weeks.

Chronic GN develops slowly. In some cases, people may not experience symptoms for several years. Signs and symptoms can include:

blood in the urine

protein in the urine

swelling of the face or ankles

frequent nighttime urination

bubbly or foamy urine

7. Medications

The following medications may cause hematuria:

Blood thinners: These drugs help prevent blood clots, but some types, including warfarin and aspirin, may cause blood in the urine.

Nonsteroidal anti-inflammatory drugs, or NSAIDs: If a person uses these for long periods, they can damage the kidneys and cause blood to appear in urine tests. However, they are unlikely to cause visible blood in the urine.

Cyclophosphamide and ifosfamide: These are chemotherapy drugs that can cause hemorrhagic cystitis, which is the sudden onset of blood in the urine and bladder pain and irritation.

8. Prostate cancer

With early diagnosis and treatment, prostate cancer is usually curable. However, few men will experience symptoms during the early stages of the disease, so it is vital to attend regular screening tests.

When symptoms of prostate cancer do occur, they may be similar to those of BPH.

Additional signs and symptoms of prostate cancer include:

dull pain in the lower pelvic area

pain in the lower back, hips, or upper thighs

painful ejaculation

blood in the semen

appetite loss

unexplained weight loss

bone pain

Men experiencing any of the symptoms of prostate cancer should visit a doctor as soon as possible.